If the lizard is otherwise eating and appears healthy, I wouldn't treat it at all. Dr. Frye would disagree. He administers prophylactic treatments on a regular basis. My expertise is in mammalian and human microbiology and parasitology and not much has been published about herp paraistes, especially about the life cycles and various alternate hosts and vectors that infect herps. Fenbendazole is probably the safest treatment for worms. It is administered orally at 100 mg/kg of body weight orally every 10 days for about 3 treatments.
I think it is best to get a definite identification of any parasite or bacteria before treating empirically, but that is because I've been in the "human" field and have been fighting shot-gun antibiotic use for many years, to no avail. With herps, we don't have that kind of time, medical insurance or even convenient access to a good herp vet.
Lee Bandura